Time left 0:07:23Question 8Not yet answeredMarked out of 1.00Flag questionTipsQuestion textA trial examining a new intervention and measuring the outcome of stroke had a final result of:RR 1.2, 95%CI 0.9 to 1.5.Select the best interpretation of this result.Question 8Answera.The intervention increased the average risk of stroke by 20% and the real result is likely to lie between a 10% decrease and a 50% increase. The result is not significant.b.The intervention increased the average risk of stroke by 20% and the real result is likely to lie between a 10% decrease and a 50% increase. The result is significant.c.The intervention decreased the average risk of stroke by 20% and the real result is likely to lie between a 10% increase and a 50% decrease. The result is not significant.d.The intervention decreased the average risk of stroke by 20% and the real result is likely to lie between a 10% increase and a 50% decrease. The result is significant.
Question
Time left 0:07:23Question 8Not yet answeredMarked out of 1.00Flag questionTipsQuestion textA trial examining a new intervention and measuring the outcome of stroke had a final result of:RR 1.2, 95%CI 0.9 to 1.5.Select the best interpretation of this result.Question 8Answera.The intervention increased the average risk of stroke by 20% and the real result is likely to lie between a 10% decrease and a 50% increase. The result is not significant.b.The intervention increased the average risk of stroke by 20% and the real result is likely to lie between a 10% decrease and a 50% increase. The result is significant.c.The intervention decreased the average risk of stroke by 20% and the real result is likely to lie between a 10% increase and a 50% decrease. The result is not significant.d.The intervention decreased the average risk of stroke by 20% and the real result is likely to lie between a 10% increase and a 50% decrease. The result is significant.
Solution
The correct answer is a. The intervention increased the average risk of stroke by 20% and the real result is likely to lie between a 10% decrease and a 50% increase. The result is not significant.
Here's why:
The Relative Risk (RR) of 1.2 indicates that there is a 20% increased risk of stroke with the intervention compared to without it.
The 95% Confidence Interval (CI) of 0.9 to 1.5 means that we are 95% confident that the true RR lies somewhere between a 10% decrease in risk (0.9) and a 50% increase in risk (1.5).
However, because the CI includes 1 (which would indicate no difference in risk), the result is not statistically significant. This means that we cannot be sure that the observed effect is not due to chance.
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